Shipping is all over the place right now.
If you have bought a physical book in the last 6 months;
1) I've made a poll for those in a hurry - just upvote whichever seller you recommend.
1.5) If there's a shop I've missed please post about it.
2) For those not in a hurry - please post:
Where are you buying books lately?
Did they arrive safely?
How long did it take?
Start with Op shops. They are cheap.
And one step before that: libraries.
Also browse street libraries if you go on walks for random books you weren't (or were vaguely) aware of but once you find out, you can't put down.
The Street libraries are what kept me going through the “lockdown”. I got some good books and dropping some off gave me more room on my bookshelf. I sprayed them with Glen 20 when I got home and left them in the garage for a few days.
Zookal
I check the prices on https://booko.com.au/ which shows you the cheapest price including postage. I just buy from whatever seller has the best price. I think I have used most of the ones on your list and all have been fine. Shipping times vary according to the country the book is coming from.
QBD/Big W. Walk in store and collect book, and don't worry about shipping time…
Use Booko to make sure price is decent